linux-kernel - Re: [PATCH] staging: vc04_services: remove empty functions

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Date:   Thu, 19 Oct 2023 12:55:11 +0200
From:   Karolina Stolarek <karolina.stolarek@...el.com>
To:     Calvince Otieno <calvncce@...il.com>
CC:     <outreachy@...ts.linux.dev>, <gustavo@...eddedor.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        <linux-staging@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: vc04_services: remove empty functions

On 19.10.2023 11:46, Calvince Otieno wrote:
> The functions vchiq_debugfs_init(), vchiq_debugfs_deinit(),
> vchiq_debugfs_add_instance(), and vchiq_debugfs_remove_instance()
> are declared and defined but contains no code or statements.
> They do nothing.
> 
> Signed-off-by: Calvince Otieno <calvncce@...il.com>
> ---
>   .../interface/vchiq_arm/vchiq_arm.c              |  3 ---
>   .../interface/vchiq_arm/vchiq_debugfs.c          | 16 ----------------
>   .../interface/vchiq_arm/vchiq_debugfs.h          |  8 --------
>   .../interface/vchiq_arm/vchiq_dev.c              |  4 ----
>   4 files changed, 31 deletions(-)
> 
> diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> index eef9c8c06e66..b802d1ecc8f6 100644
> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> @@ -1806,8 +1806,6 @@ static int vchiq_probe(struct platform_device *pdev)
>   	if (err)
>   		goto failed_platform_init;
>   
> -	vchiq_debugfs_init();
> -
>   	vchiq_log_info(vchiq_arm_log_level,
>   		       "vchiq: platform initialised - version %d (min %d)",
>   		       VCHIQ_VERSION, VCHIQ_VERSION_MIN);
> @@ -1838,7 +1836,6 @@ static void vchiq_remove(struct platform_device *pdev)
>   {
>   	vchiq_device_unregister(bcm2835_audio);
>   	vchiq_device_unregister(bcm2835_camera);
> -	vchiq_debugfs_deinit();
>   	vchiq_deregister_chrdev();
>   }
>   
> diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_debugfs.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_debugfs.c
> index dc667afd1f8c..7e45076e5ebd 100644
> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_debugfs.c
> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_debugfs.c
> @@ -228,20 +228,4 @@ void vchiq_debugfs_deinit(void)
>   
>   #else /* CONFIG_DEBUG_FS */
We need to have these definitions, so a kernel with no CONFIG_DEBUG_FS 
selected builds. Have you experimented with this config with your 
changes applied?

All the best,
Karolina

>   
> -void vchiq_debugfs_init(void)
> -{
> -}
> -
> -void vchiq_debugfs_deinit(void)
> -{
> -}
> -
> -void vchiq_debugfs_add_instance(struct vchiq_instance *instance)
> -{
> -}
> -
> -void vchiq_debugfs_remove_instance(struct vchiq_instance *instance)
> -{
> -}
> -
>   #endif /* CONFIG_DEBUG_FS */
> diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_debugfs.h b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_debugfs.h
> index e9bf055a4ca9..76424473c32b 100644
> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_debugfs.h
> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_debugfs.h
> @@ -10,12 +10,4 @@ struct vchiq_debugfs_node {
>   	struct dentry *dentry;
>   };
>   
> -void vchiq_debugfs_init(void);
> -
> -void vchiq_debugfs_deinit(void);
> -
> -void vchiq_debugfs_add_instance(struct vchiq_instance *instance);
> -
> -void vchiq_debugfs_remove_instance(struct vchiq_instance *instance);
> -
>   #endif /* VCHIQ_DEBUGFS_H */
> diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c
> index 841e1a535642..953f39f537a8 100644
> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c
> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c
> @@ -1185,8 +1185,6 @@ static int vchiq_open(struct inode *inode, struct file *file)
>   	instance->state = state;
>   	instance->pid = current->tgid;
>   
> -	vchiq_debugfs_add_instance(instance);
> -
>   	init_completion(&instance->insert_event);
>   	init_completion(&instance->remove_event);
>   	mutex_init(&instance->completion_mutex);
> @@ -1297,8 +1295,6 @@ static int vchiq_release(struct inode *inode, struct file *file)
>   
>   	free_bulk_waiter(instance);
>   
> -	vchiq_debugfs_remove_instance(instance);
> -
>   	kfree(instance);
>   	file->private_data = NULL;
>